Escala diagramática para avaliação de severidade de mancha-parda em arroz

Lenz, Giuvan; Balardin, Ricardo Silveiro; Corte, Gerson Dalla; Marques, Leandro Nascimento; Debona, Daniel

doi:10.1590/s0103-84782010005000061

Cited by 25 publications

(26 citation statements)

References 10 publications

(11 reference statements)

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“…These results are somewhat in contrast to those by Lenz et al. (), testing the other BS disease diagram, who reported that precision, and not accuracy, was most improved for a group of eight raters when quantifying disease severity using disease diagrams compared with unaided estimates. Results from our study did not indicate that precision was greatly improved; rather for some raters precision was actually reduced when using standard diagrams.…”

Section: Discussioncontrasting

confidence: 99%

Accuracy and Reliability of Severity Estimates Using Linear or Logarithmic Disease Diagram Sets in True Colour or Black and White: a Study Case for Rice Brown Spot

Schwanck

Ponte

2014

Journal of Phytopathology

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Four disease diagram sets to aid in assessments of rice brown spot severity were developed and evaluated with regard to accuracy and reliability of the estimates. These sets had severity increments in a linear (LIN) or logarithmic (LOG) fashion with the diagrams depicted in true colour (COL) or black and white (BW). Ten inexperienced raters evaluated one of the sets, totalling forty raters. On each group of raters, the assessment was made first unaided and then aided with the respective diagram set. The minimum and the maximum severities of the diagram sets were 0.5 and 36%, respectively, and the five intermediate severity values were 6, 12, 18, 24 and 32% for the LIN diagram sets, and 1.8, 3.3, 6, 11 and 20% for the LOG sets. Overall agreement, measured by the Lin's concordance correlation coefficient (ρc), increased considerably when using the aid (unaided mean ρc = 0.53, aided mean ρc = 0.87) due to a strong reduction in the systematic bias, measured by the bias correction factor Cb (unaided mean Cb = 0.60, aided mean Cb = 0.95). All diagrams led to similar accuracy and precision, but a consistent overestimation was still observed when using the LIN sets, and variability for the absolute errors was higher for the LOG sets, compared with the LIN sets. Estimates using the diagram sets were more reliable based on the intraclass correlation (mean ρ = 0.79–0.86) compared with unaided estimates (mean ρ = 0.51–0.67). Raters exhibited preference for specific values, such as the ‘knots’ (10, 20, 30%, etc.), and the severity values represented in the diagrams, especially when using the LIN sets. The diagram sets similarly helped to improve accuracy and reliability of estimates of rice brown spot epidemics.

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Section: Discussioncontrasting

confidence: 99%

Accuracy and Reliability of Severity Estimates Using Linear or Logarithmic Disease Diagram Sets in True Colour or Black and White: a Study Case for Rice Brown Spot

Schwanck

Ponte

2014

Journal of Phytopathology

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“…However, severity levels below 1% are not practical, since the early symptoms are few oilspots which are diffi cult to visualize. The scale levels can be subdivided into smaller intervals (NASCIMENTO et al, 2005;KOWATA et al, 2008;LENZ, et al, 2010). However, it must be prepared based on the law of Weber-Fechner visual acuity and presenting logarithmic increments between severity levels (NUTTER JR. & SCHULTZ, 1995;ANGELOTTI et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine

et al. 2014

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“…Salgado et al (2009), evaluated phoma leaf blight severity of coffee trees (Corrêa et al 2009;Lenz et al 2009Lenz et al , 2010Santos et al 2010;Correia et al 2011;Custódio et al 2011). …”

Section: Discussionmentioning

confidence: 99%

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

Librelon

Souza

Pereira

et al. 2015

Australasian Plant Pathol.

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The aim of this study was to develop a diagrammatic scale to evaluate angular leaf spot (ALS) severity in primary leaves of common bean. A diagrammatic scale was developed and validated with nine levels of severity: 0 %; 0.1 to 0.5 %; 0.6 to 4.0 %; 4.1 to 7.0 %; 7.1 to 16 %; 16.1 to 26 %; 26.1 to 32 %; 32.1 to 38 % and 38.1 to 60 %. The use of this scale, associated with the early inoculation method, allowed rating of ALS severity in common bean leaves in the V2 stage of development that is, when the primary leaves are fully open. Validation of the scale was performed by 14 Evaluators. These Evaluators estimated the severity in 40 common bean leaves with different levels of severity, previously measured by the software Quant®. The accuracy and precision of each Evaluator were determined by simple linear regression, by comparing between actual severity, measured electronically, and that estimated by the Evaluator. Without the scale, most of the Evaluators overestimated the severity of the disease. With the scale, the Evaluators obtained better levels of accuracy and precision, with absolute errors less than 5 %. The diagrammatic scale proposed proved to be adequate for early performance of the pathogenicity test.

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Escala diagramática para avaliação de severidade de mancha-parda em arroz

Abstract: Escala diagramática para avaliação de severidade de mancha-parda em arroz Diagrammatic scale for assessment of rice brown spot severity RESUMO Uma escala diagramática com seis níveis: 1,6; 3,2; 6,4; 12,6; 23

Cited by 25 publications

References 10 publications

Accuracy and Reliability of Severity Estimates Using Linear or Logarithmic Disease Diagram Sets in True Colour or Black and White: a Study Case for Rice Brown Spot

Accuracy and Reliability of Severity Estimates Using Linear or Logarithmic Disease Diagram Sets in True Colour or Black and White: a Study Case for Rice Brown Spot

Elaboration and validation of a diagrammatic scale to assess downy mildew severity in grapevine

Diagrammatic scale to evaluate angular leaf spot severity in primary leaves of common bean

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